One Shoe On...

Packing up after this morning's quartet rehearsal, I was discussing tuning with the cellist.  And then I realised she was wearing only one shoe.

Me: Ah... Do you realise you've lost a shoe?
Cello: Oh, I haven't lost it, it just hurts my foot to have it on.  So I took it off.  [sigh] I guess I better put it back on so I don't look like a crazy person for the rest of the day...